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CGP EDU Academic Team
Published on: August 14, 2026
A two slit Young's interference experiment is done with monochromatic light of wavelength 
. The slits are 2 mm apart. The fringes are observed on a screen placed 10 cm away from the slits. Now transparent plate of thickness 0.5 mm is placed in front of one of the slits and it is found that the interference pattern shifts by 5 mm . The refractive index of the transparent plate is:
Text Solution
Verified by ExpertsThe correct answer is:
A
Clearly the central maxima at P (initially) shifts to P' where 
.
So now, path difference at P' must be zero.
Y 
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